1992 K75S starts on its own - BMW Luxury Touring Community
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post #1 of 3 Old May 20th, 2020, 3:18 pm Thread Starter
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1992 K75S starts on its own

Not to make light of my recent woes, but my bike is what you would call a "self starter" (if I had a kid, that would be wonderful )

This is the current problem I'm having with my 1992 K75S; I hope you can take a moment to help me with it:
1) After many months of just sitting there (on a trickle charge), my battery died (fortunately in my garage)
2) I charged it and it came back to life (100%)
3) When I attempt to attach the battery cables the starter kicks in without a key or me pushing the starter button
(it even attempts to start when I turn the kill switch on)

Any thoughts would be greatly appreciated and if you know of any competent BMW mechanics in South Florida please let me know!

Thanks in advance to all who reply,
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post #2 of 3 Old May 21st, 2020, 9:05 am
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Re: 1992 K75S starts on its own

your starter relay's points are welded together. It usually happens when you try to start the bike with a low battery. It happened to me a few times on a K100 . I replaced the relay once , then the second time I took the cover off the relay and filed the points to clean them up.

Patric Blackman
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post #3 of 3 Old May 21st, 2020, 2:11 pm
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Re: 1992 K75S starts on its own

One more thing you can try is to turn on the key, then hold the negative terminal to the battery and repeatedly press the starter button while it is self cranking. This will "flex" the relay armature and may break the welded contacts apart. You can do this even if the bike does start. Press it at least 10-15 times then shut it off to see if it is still stuck.
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